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CMP is used as intermediate in the preparation of 1-[[3-(6,7-dihydro-1-methyl-7- oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4- methlypiperazine citrate. The chemical name of this compound is: 1-[[3-(4,7- Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4- ethoxyphenyl]sulfonyl chloride (CMP), and it was purchased from Aryl S.A. Its formula is:

HN

O CH3

3CHOCH3

N

N

Cl

O O

S

N

CMP

Different samples of CMP were analyzed by X-Ray Powder diffraction and found to contain one crystal form α.